IC Pin orientation

SgtWookie

Joined Jul 17, 2007
22,230
The manufacturer's datasheet is always the best place to start:
http://www.st.com/stonline/products/literature/ds/1463/tda2822d.pdf

What's a bit unusual in your case is that there is no dimple next to the #1 pin as shown in the datasheet.

However, you can assume that with the writing oriented so that you can read it (as in the photo you posted), that pin #1 is on the lower left.

From there to the right, it's 2, 3, 4 - then straight up to #5, then left to pins 6, 7, 8 in that order.

It's not really intuitive, but after you've looked at a few dozen IC's, you start to realize that when the writing is how you can read it, pin #1 is on the lower left.

 

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SgtWookie

Joined Jul 17, 2007
22,230
Retched,
Please don't confuse our OP.

ST Microelectronics frequently uses just their logo to represent the dimple. It saves a manufacturing step.
 

retched

Joined Dec 5, 2009
5,207
I wasn't trying to confuse our OP.

On some they put a bevel. No indent, no dot nothing though sometimes it has dots ON BOTH SIDES. Of course they've made 15 billion of the chips so the die is worn out and the top looks like a bent sheet of paper.
 

Audioguru

Joined Dec 20, 2007
11,248
The datasheet also shows a line or a bevel on the edge beside pins 1 to pin 4. The photo seems to show a bevel only on that side.
 
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